Handle for pneumatic tools.



No. 781,942. PATENTED FEB. 7, 1905. G. H. GILMAN & J. PLAYER.

HANDLE FOR PNEUMATIC TOOLS.

APPLICATION FILED MAY 26, 1904.

2 SHEETS-SHEET l.

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gluueurom N0. 781,942. PATENTED FEB. '7, 1905. G. H. GILMAN & J. PLAYER.

HANDLE FOR PNEUMATIC TOOLS.

APPLICATION FILED MAY 26, 1904.

2 SHEETSSHEET 2.

20 tion on line 2 of Fig. l.

Patented February 7, 1905.

IINTTET) STATES PATENT OEEicE.

GEORGE II. (IILIIAN. OF FRANKLIN, PENNSYLVANIA. AND JOHN PLAYER, OFRIVER FOREST, ILLINOIS.

HANDLE FOR PNEUMATIC TOOLS.

SPECIFICATION forming part of Letters Patent No. 781,942, dated February'7', 1905.

Application filed May 26, 1904. Serial No. 209,964.

Io lication, reference being had therein to the accompanying drawings.

()ur invention relates to an improved handle for pneumatic tools, andwill be fully understood by a reference to the accompanying 15 drawings,which form a part of this specilication, and in which-- Figure I shows alongitudinal section of our preferred form of handle attached to a Fig.2 is a see- Fig. 3 shows a longitudinal section of a modilied form ofhandle. Fig. & is a section on line a I of Fig. 3. Fig. is a section online 5 5 of Fig. 3. Fig. 6 is a longitudinal section of another 5modilied form of our handle. Fig. 7 is an enlarged longitudinal sectionof the inlet-valve used in the handle shown at Fig. 6. Fig. 8 is asection on line 8 b of Fig. 7.

The object of our invention is to provide a handle for pneumaticimplements, and more especially drills and hammers, which embodies aneilicient and durable mlmission-valve for the motive agent, with theoperating mechanism for said valve in such position relative to 5 thehandle of the drill that it may be manipulated by the same hand whichgrasps the handle without removing it therefrom.

By an inspection of Figs. l, 3, and 6 it will be readily understood thatthe admission-duct pneumatic drill or hammer.

40 proper occupies a position either extending around or approximate tothe base or that portion of the handle which forms the socket or plug,as the case may be, for the reception of the cylinder and is not locatedin the handpiece or grip or does not pass through the same as in someforms of handles which have heretofore been devised.

The construction of our handle as shown in Fig. I is substantially asfollows: In the socket 1, which receives the cylinder or barrel 2, isformed an annular duct 3, to which a supply of air is admitted throughthe port I, which port I may be located at any convenient point aboutthe circumference of said socket. An annularduct 5 is also formed aboutthe periphery of the cylinder 2, and from said duct 5 communication ishad with the interior of the cylinder by means of the passages ti. Apassage T leads from duct 3 to duct 5, and the passage of air throughsaid port 7 is controlled by a valve 8, an enlarged chamber 9 for whichis provided in the upper side of the socket l and into which duct 3leads. Valvechamber 9 is provided with a suitable cap 10, through whichpasses the valve-stem 11, the outer end of which stem is provided withsuitable means to which to connect a lever 12. A fulcrum '13 is providedfor said lever which extends rearwardly and is formed into a convenientthumb-piece II, which is located in such proximity to the grip 15 of thehandle that the thumb of the operator will easily and naturally restthereon as he grasps the handle of the drill. The object of extendingduct 5 entirely around the drill-cylinder is that by so doing it is notnecessary to specially locate the passage 7 circumferentially of saidcylinder, as would be necessary in case it were required to registerwith a single opening.

It will be readily understood that when our drill is in service aconstant supply of compressed air is admitted to the port I andmaintained in the duct 3 and that when valve 8 is raised by means of thelever 12 the air passes through passage 7 into duct and into thepassages 6 to the interior of the cylinder, where its work isaccomplished.

In Figs. 3 and 6 are shown modilied forms of our handle, and theprincipal modification shown in these views over that shown in Fig. 1 isthe form of zuhnission-valve, the inlet port and the duct leadingtherefrom to the valve being similarly located in all the forms hereshown. In said Fig. 2) the admissionport is shown at I, and duct 3'leads therefrom to valve 8. As said duct 3 nears the valve 8' it is madelong and narrow, and through one side of said valve, which is hollow, aswill be seen from an inspection of Fig. 4:, is formed an elongated slot4:", adapted to register with the approximate end of said duct 4. Saidvalve 8 is operably seated in a cylinder 16, and to the rear end of saidvalve is attached a stem 17 which extends through the head of saidcylinder, and to said stem is attached a lever by means of which valve 8is rotated in such manner that slot 4 is carried in or out of registerwith duct 4. When duct 4 and slot 4: are in register, air passes to theinterior of valve 8" and through the open end thereof into duct 5 andfrom thence through passages 6 to the interior of the cylinder 2. Thevalve seat or chamber 16 in said cylinder 16 is somewhat longer than thevalve 8 and a spiral spring 18 is placed about the stem 17, bearingagainst the rear wall of said chamber and against the rear end of thevalve. Into the upper or rear end of cylinder 16 is affixed a cap orplug 19, having on its outer face the serrations 20, and to stem 17 isrigidly aflixed the disk or washer 21, having thereon correspondingserrations adapted to mesh with those upon cap 19, and upon said disk 20is formed a sleeve 22, which slips over stem 17 and by means of whichsaid disk is rigidly attached to said stem. To said sleeve 22 isattached the thumb-piece or lever 23, by means of which the valve 8 isoperated. The otfice of spring 18 is to hold the serrations yieldablyinmesh, so that the valve may not be too easily operated, said serrationsserving also as graduations to indicate the extent of opening of thevalve 8. l

The modification shown in Fig. 6 is constructed substantially asfollows: The inletport 4 and duct v3 are identical as to location withthose in Fig. 3; but at the center of the base or socket 1 is formedaseat which receives the valve mechanism, (shown in an enlarged sectionalview in Fig. 7,) which said mechanism consists of a cylinder 24, havinga cylindrical valve 25. Slidingly mounted therein about the periphery ofsaid cylinder is formed a channel or clearance 25, to which the duct 3leads, and through the wall of the cylinder at this point are formed anumber of ports 26 for the purpose of admitting air to the interior ofsaid cylinder. The lower interior portion of the valve-cylinder 24: isof a larger bore than the upper portion, so that when the valve 25 is inthe position shown in Fig. 7 air has free escape through the valve andabout the lower part of the same through the ports 27, which lead to theduct 7 the course of the air being indicated by the arrows in said Fig.7. When valve 25 is raised to the position shown in Fig. 6, the passageof air through the ports 26 is prevented. To the valve 25 is attachedthe stem 28, which passes through the cap 29 and through the hand-piece15 and terminates in the pushbutton 30, by means of which and the rod31' the valve is operated. Stern 28 passes through the adjustable stopor sleeve 32, which is screw-threaded into the hand-piece, and byturning the same in or out the push-button and the thereto-attached stemand valve are limited in their travel and the amount of the-opening ofports 26 may be thus regulated to any desired amount.

Having thus described our invention, what we claim as new. and desire tosecure by Letters Patent, is

In a handle for pneumatic tools, a hand piece or grip, a socket integraltherewith, adapted to the attachment of the cylinder of the tool, avalve cylinder at the top of said grip, in longitudinal alinement withsaid socket, an air-inlet duct in said socket in longitudinal alinementwith said grip and leading into said valve-cylinder, a passage leadingfrom said valve-cylinder to the cylinder of the tool, a valve in saidvalve-cylinder and means of manipulating the same substantially as andfor the purpose specified.

In testimony whereof we affix our signatures in the presence of twowitnesses.

- GEO. H. GILMAN.

' JOHN PLAYER. l Vitness es S. M. BROWN, E. E. HUGHES.

